Detaching hollow flexible bodies from their molds



Patented Oct, 192 8 UNI-TED STATESPATENT OFFICE- EMIL CZAPEK Ann Brennan WEING-AND, OFJBOMLITZ, NEAR WALSRODE, GERMANY.

,DETAGHING- orrow FLEXIBLE BomEs FROM THEIR norms.

Io Drawing. Application filed'April 5, 1927, Serial No. 181,257, and in Germany-May 30, 1925. I

This invention refers to a method of removing" or detaching substantially cap-' shaped or thimble-shaped hollow bodies of cellulose or cellulose derivatives from theof hollow bodies of cellulose or. cellulose derivatives or the like from the molds or man drels serving for the manufacture thereof the use of compressed airhas already been suggested, and it has also been proposed in connection with the manufacture of balloons to introduce any suitable moving current of a fluid or the like into the hollow body produced upon an oval mold, while simultaneously extending the outer end of its neck by hand, in order to inflate the same and to then withdraw it manually from the ovalmold.

- Now my invention'is distinguished from this previousstage of the art by the; use of-a jet of liquid projected onto the mold for.

the purpose of detaching and removing the substantially cap shaped' or thimble shaped hollow bodies of cellulose, cellulose derivatives or the like, from the mold, without the a5 'necessityof taking hold of the hollow body manually. It hasbeen shown by this means hollow bodies of the kind described are caused to quickly and safely slip 01f automatically from the mold or mandrel without any ne-' 40 cessity of using the hands in the detaching operation. Furthermore than that, other the use of a jet of liqui as comparedwith the employment of compressed air notonly as regards the detaching operation itself, as

well as with reference to the immediately following further treatment of the hollow bodies. In connection with this novel manner 0 removal of the hollow bodies they maybe charged with liquid by the jet of liquid, such as water as an instance, and by this means they may be caused to be automatically immersed in a'washing liquid.

The method may be carried out by way of exemplification in such a manner that a:

jet of liquid or a plurality of such jets may pact, on the mold the be projected against the mold or mandrel carrying the solidified, precipitated and regenerated hol-lowbody of cellulose and the like above the edge of the hollow body, and at a suitable, and preferably light pressure,

. and under a suitable angle. The liquid, such as water for instance, will penetrate between the hollow body and the molding body and" enters into the interior cavity of'the molded 4 body, and as a result thereofthe hollow body is caused to slip off from the mold. By cor- 'respondingly adjusting the velocity, the pressure and the force of the jet of liquid, and by a corresponding selection of the point from which the jet is projectedor the point of imsliding oil. may be accelerated more or less. The jet of liquid is preferably directed against the mold at substantially right angle thereto, but it is also possible within the scope of the invention to have the jet assume any other angular direction'with relation to the axis of the molding body or it may be caused to flow along the walls thereof. V

' The method of detaching and removing the molded material is not only particularly characterized by its producing a quick, smooth, neat and automatic lifting off of the hollow body of cellulose from the molds byvery simple means and without any injury to the molded body whatever and without interfering with its uses, but there is the additional important advantage that the hollow bodies which are known to have to be submitted to a cleaning and washing operamolds, are at the same time rinsed from the inside, when being slipped off the molds, and are submitted to a preliminary washing operation. Moreover, this rinsing from the inside performs, the important additional obvery important advanta es. are realized by ject thatthe hollow bodies, upon dropping oil? the molds by reason of the charge of. liquid f immersing device. or this purpose, while,

when they are detached from the molds by compressed air and the like, the hollow' bodies will float upon the surface of the purifying bath, so as to necessitate special means for the purpose of immersing them. Similar to the-rinsing of the hollow bodies from the inside thereof the molds for mandrels are rinsed on the outside thereof, and are thereby ,tion after having been removed from the is likewise applicable to other, similarly shaped or constructed hollow bodies of cellulose or of cellulose-derivatives made on molds, and it greatly facilitates the manufacture of great masses of such hollow bodies and the like. a The invention is not confined to the particular formof embodiment herein described by way of exemplification only, but it may be varied to meet the requirements of use, no other limitations being intended than those imposed by the scope of the appended claims hereinafter annexed We claim i l 1. The method of detaching molded flexible, substantially cap shaped hollow bodies from their molds and removing them therefrom without manual operation of the bodies, which method consists in angularly directing a jet of liquid onto and against the mold carrying such hollow bodies, thereby filling said bodies with liquid and causing them to slip ofl the molds.

2. The method of detaching molded, sub

stantially cap shaped hollow bodies of cellulose compounds from their molds and removing them therefrom without manual operaible, substantially cap shaped hollow bodies from their molds and removing them therefrom without manual operation of the bodies,

which method consists in directing a jet of liquid onto and against such hollow bodies, while on the mold, thereby filling them with liquid and causing them to slip off the mold, and receiving the dropped off bodies in a supply of treating liquid.

4. The method of detaching molded, substantially cap shaped hollow bodies of cellulose compounds from their molds, and removing them therefrom, which method consists in angularly directing a jet of liquid against such hollow bodies, while seated upon the mold, thereby causing the cavities of said bodies to be filled with liquid, and causing them to drop off the molds, and receiving the dropped ofl hollow bodies in a supply of treating liquid.

5. The method of detaching molded bodies of cellulose compound and the like from their molds, which consists in projecting a jet of liquid onto and against said bodies, while seated on the molds, thereby causing the cavities of the bodies to be filled with the liquid, causing the filled bodies to drop ofi into a supply of treating liquid and to become immersed in such treating liquid.

In testimony whereof we aflix our signatures.

DR. EMIL CZAPEK. RICHARD WEINGIAND. 

